1) Accidental 2) Adscititious 3) Adventitious 4) Alien 5) Being outside a thing 6) External 7) Extraneous 8) Foreign 9) French word used in English 10) Inessential 11) Nonessential 12) Not a basic part or quality 13) Not essential or inherent 14) Outside 15) Outward or external 16) Unessential 1) Accidental 2) Adscititious 3) Adventitious 4) Inessential 5) Unessential 
Foreign, from outside sources.
• (a.) Attached partly to an organ or limb and partly to some other part/ -- said of certain groups of muscles. Opposed to intrinsic. • (a.) Not contained in or belonging to a body; external; outward; unessential; -- opposed to intrinsic.
1. Not contained in or belonging to a body; external; outward; unessential; opposed to intrinsic. 'The extrinsic aids of education and of artificial culture.' (I. Taylor) ... 2. <anatomy> Attached partly to an organ or limb and partly to some other part said of certain groups of muscles. Opposed to intrinsic. ... Origin: L. Extrinsecus; exter...
(ek-strin´zik) of external origin.
Ex·trin'sic adjective [ Latin extrinsecus ; exter on the outside + secus otherwise, beside; akin to English second : confer French extrinsèque . See Exterior , Second .] 1. Not contained in or belonging to a body; external; outward; unessent...
Type: Term Pronunciation: eks-trin′sik Definitions: 1. Originating outside of the part where found or on which it acts; denoting especially a muscle, such as extrinsic muscles of hand.
Extrinsic: 1. Not an essential or inherent part of a something such as a structure. 2. Coming from the outside. Extrinsic forces can mold the head before birth. From the Latin extrinsecus meaning from outside. The opposite of extrinsic is intrinsic.
(eks-trin;sik) Pertaining to an outside or external origin.
[adj] - not forming an essential part of a thing or arising or originating from the outside
adjective not forming an essential part of a thing or arising or originating from the outside; `extrinsic evidence`; `an extrinsic feature of the new building`; `that style is something extrinsic to the subject`; `looking for extrinsic aid`
(Lat. exter, out + secus, beside) Having external value. Value in the relation of wholes to other wholes. -- J.K.F.
Latin extrinsecus = from without, hence (usually) a muscle (usually) originating outside the part on which it acts.
not essential or inherent; not a basic part or quality; extraneous: facts that are extrinsic to the matter under discussion. · being outside a thing; outward or external; operating or coming from without: extrinsic influences. · (of certain muscles, nerves, etc.) originating outside the anatomical limits of a part.
[SAT terms] not forming an essential part of a thing